It’s no secret that Carrie Underwood has a rockin’ bod. Her rock hard abs and long, lean legs are impressive, especially for a 34-year-old mom. Her personal trainer Erin Oprea helps the country superstar stay fit, despite her busy schedule. Check out the snapshot below of Underwood enjoying some lake time in an apricot colored bikini from her Calia clothing line. She’s like a walking advertisement for swimwear…

Underwood’s secret to staying in shape is simple. She prioritizes health and fitness and squeezes in a workout whenever she can. Even if her schedule only allows 20 minutes, she makes it work.

“It just happens if and when it happens,” Underwood told PEOPLE in May. “I’ve gotten a lot better at doing what I can when I can, but also cutting myself a little slack. You have to!”

Opera says that Underwood is capable of tackling very intense workouts with heavy weights. She aims for variability in the star’s routines, so she gets the most out of her gym time.

“Carrie’s workouts change quite a bit, sometimes she goes heavier. But not always, some days we do no weights, and we do plyometric-based stuff like jumping and tabatas,” Oprea tells PEOPLE.

“It’s really fun to see her change over the years — I’ve known Carrie for nine years now. She’s a rockstar, and really, it takes hard works and discipline to reach your goals. Put those two together and you’ll hit it!”

On days when Underwood can’t make it to the gym, she tries to be as active as possible. Having a two-year-old son who’s full of energy makes this easy.

“Sometimes I’m like, my workout today is going be running around after my kid,” says Underwood. “If we’re going to go to the park, why not run there and push him in the stroller? Then I get a good cardio session to and from, and then he gets to play, so everybody wins.”

Underwood’s fitness apparel line targets all women, from runners to yogis to everything in between. “I created Calia to make it easier for me and all other women to work in working out,” says Carrie. The clothes feature stylish trends like breathable mesh, multiple straps, concealed pockets, and laser-cut details.